Answer:
0.875
Step-by-step explanation:
they're proportional.
Your brother has $2000 saved for a vacation. His airplane ticket is $637. Write and solve an inequality to find how much he can spend for everything else.
Let x be the amount your brother can spend. Subtracting the cost of the plane ticket from savings, we have:
x <= 2000 - 637
x <= 1,363
You are reading an article in your school newspaper
Answer: Option A. 1.5
Mean shoe size of the students in a math class: µ=7.5
Standard deviation: σ
Most of the shoe sizes (x) fall within 1 standard deviation:
µ-1σ<x< µ+1σ
µ-σ<x< µ+σ
<span>or between a size 6 and a size 9:
</span>6<x<9
Comparing µ-σ<x< µ+σ with6<x<9:
µ-σ=6 or µ+σ=9
Replacing µ=7.5 above:
7.5-σ=6 or 7.5+σ=9
Solving for σ:
7.5-σ-7.5=6-7.5 or 7.5+σ-7.5=9-7.5
-σ=-1.5 or σ=1.5
σ=1.5 or σ=1.5
Then σ=1.5
